The purpose of the research is to comprehend earth scientific characteristics and genetic origins of high-temperature anomalous areas, and to examine the evaluation methods for the effects of heat and hydrothermal water on surroundings of geological repository of high-level nuclear waste at the stages of extraction of Preliminary Investigation Areas (PIAs) and of its following site-specific surveys. This special issue is prepared to introduce the outline of the project and preliminary result of each subdivided research subject. The conceptual model of subsurface thermal anomalies is tenta tively proposed. The research contents and results are described briefly as follows. 1) An examination of earth scientific characteristics of high-temperature anomalous areas (1)Examinations of extraction of thermal anomaly and comprehensive method of characteristics based on discharged heat from hot springs The problems on data acquisition, data use and calculation of discharged heat from hot springs, are investigated. The data of hot springs recently exploited are newly collected at Tohoku district. (2)An examination of construction of data base for rock alteration, and partially construction of data base General software is investigated how to be utilized for construction of the data base of rock alter ation, and the data base is partially constructed for geothermal bore hole data in Kyushu district. (3) Information gathering on earth scientific characteristics and 2D-3D visualization of data The distribution maps concerning topography, geology, seismic hypocenter, electric resistivity, Cu rie-point isotherm depth, and subsurface isotherms are collected and summarized as input data to the data base for 2-D and 3-D visualization. 2) An examination of genetic origin of high-temperature anomalous areas The domestic and international references are surveyed on analytical methods using multi-compo nents and multi-phases simulators for fluid flow, and on analytical regions and boundary conditions for regional analysis. 3) An examination of survey, analysis and evaluation methods (1)Analytical method for deep subsurface structures by electromagnetic survey Pre-existing electromagnetic (MT) data in Tohoku district are re-analyzed. It is recognized that tem perature anomalous zones are presumably identified as low electric resistive zones. (2) Analytical method of deep subsurface structures by hypocenter distribution Deep-seated geothermal resources map and hypocenter distribution map in Tohoku district, are com pared each other. It is recognized that hypocenter distribution is useful to identify the hydrothermal areas. (3) Analytical method of long-term change of geothermal system by radiometric dating method It is confirmed by reference survey that ESR dating is an optimum method for age-determination of geothermal activity. The research subjects and possibilities of ESR applications are investigated. (4) Evaluation method for heat and hydrothermal activity effects based on fluids geochemistry Characteristics and diversity of fluids in granitic bodies are summarized by reference survey. The subjects to be investigated are listed.